Nitroxide-Mediated Radical Dispersion Polymerization of Styrene in Supercritical Carbon Dioxide Using a Poly(dimethylsiloxane-block-styrene) Alkoxyamine as Initiator and Stabilizer
✍ Scribed by Ronan McHale; Fawaz Aldabbagh; Per B. Zetterlund; Masayoshi Okubo
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 188 KB
- Volume
- 27
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: Nitroxide‐mediated dispersion polymerization of styrene in supercritical carbon dioxide has been performed successfully at 110 °C using a new polymeric so‐called inistab species, which fulfils the dual functions of an initiator and a colloidal stabilizer. The inistab species comprised a poly(dimethylsiloxane) block and a polystyrene block end‐capped with the nitroxide N‐tert‐__N‐__butyl‐N‐[1‐diethylphosphono‐(2,2‐dimethylpropyl)] nitroxide (SG1). The dispersion polymerization resulted in sub‐micron sized polymer particles and polymers of narrow polydispersity.
TEM micrograph of PS particles prepared in the dispersion polymerization of S in scCO~2~ in the presence of PDMS(\overline M _{\rm n} = 6 500)‐b‐PS(\overline M _{\rm n} = 4 500)‐SG1 at 110 °C.
magnified imageTEM micrograph of PS particles prepared in the dispersion polymerization of S in scCO~2~ in the presence of PDMS(\overline M _{\rm n} = 6 500)‐b‐PS(\overline M _{\rm n} = 4 500)‐SG1 at 110 °C.